[linux-usb] Is UAC1 (USB Audio Class 1.0) broken?

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Hi Community, Felipe,

I am trying to get UAC1 working on Freescale i.MX6SL EVK board (as USB peripheral device), which is based on kernel 3.10.17.

In order to get UAC1 working with my Ubuntu 12.04 LTS host, I have to make a few changes to driver/usb/gadget/f_uac1.c

I check Mr. Torvald's master branch, some kernel stable branches, something similar to my change to f_uac1.c is not there.

Then, I did some more basic testing, and found:
1) Windows 7 can not detect. Still need more work to get Windows 7 detected.
2) MacOS (forgot exact version) complains 'The selected device has no output controls', which results in that I can not adjust volume. Music playback via UAC1 on MacOS is no problem.

Anybody tried UAC1 (or UAC2) recently? Is UAC1 broken?

Thanks.
Xuebing Wang
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